Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.5: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Atomistic spin dynamics simulations of chiral spin structures at surfaces — •Stephan von Malottki, Bertrand Dupé, and Stefan Heinze — Institut für Theoretische Physik und Astrophysik der Christian-Albrechts-Universität zu Kiel, Leibnizstr. 15, 24118 Kiel, Germany

Chiral magnetic structures on surfaces such as domain walls or skrymions are promising candidates for spintronic devices [1]. Therefore, it is of great interest to understand the formation, stability and motion under external stimuli of such spin structures. In order to study these issues, we perform atomistic spin dynamics simulations, based on a numerical solution of the Landau-Lifshitz-Gilbert-equation. We consider the interplay of exchange and Dzyaloshinskii-Moriya interaction in spin structures at surfaces as well as the magnetocrystalline anisotropy. We treat exchange interactions beyond an effective exchange coupling, allowing to tackle systems in which frustration due to competing ferro- and antiferromagnetic coupling is important [3]. Additionally, higher order exchange interactions, namely the 4-spin and biquadratic interaction, are considered. We study the dynamics of chiral spin structures under external magnetic or electric fields, as well as with spin polarized electrical currents.

[1] A. Fert et al., Nature Nanotech 8 (2013). [2] J. H. Mentink et al., J. Phys.: Condens. Matter 22 (2010). [3] B. Dupé et al., arXiv:1503.08098 (2015).